Midlife and late-life cognitive activity tied to lower dementia risk
Per standard-deviation increase, odds ratios for Alzheimer's disease dementia were 0.66 for midlife and 0.50 for late-life cognitive activity, but 0.91 for childhood activity.
Neurology Open Access
In a cohort of 1,950 older adults from the Chicago Health and Aging Project, cognitive activity in midlife and late life was independently associated with a lower risk of Alzheimer's disease dementia. Participants had an average age of 73 years; 63% were female and 54% were Black adults. Researchers assessed cognitive activity across the life course, evaluating childhood pursuits like reading and games, midlife occupational complexity, and late-life activities such as reading, visiting museums, and playing chess. Over the follow-up period from 1993 to 2012, 391 individuals (20.1%) developed Alzheimer's disease dementia. While early-life cognitive activity was not significantly associated with dementia risk, midlife and late-life activities each showed independent associations with lower risk, with late-life activity exhibiting the largest effect.
Why it matters
The findings suggest that cognitive stimulation continues to support brain health into advanced age, indicating that opportunities to build cognitive resilience persist across adulthood.
Caveats
Because this was an observational study, it cannot demonstrate cause and effect. In addition, early-life activities relied on retrospective reporting, and midlife cognitive engagement was estimated using occupational complexity rather than direct measurement.
The paper
Cognitive Activity From Early to Late Life and the Risk of AD Dementia: A Life Course Study
Department of Internal Medicine
Neurology Open Access · 10 Jan 2025